Single-cavity triple-mode cavity duplexer based on bending grounded probe feed

Abstract

The invention discloses a single-cavity triple-mode cavity duplexer based on bending grounded probe feed. The duplexer comprises a rectangular external cavity, two rectangular internal cavities formed in the external cavity, and a dielectric plate arranged at the bottom of the rectangular external cavity; the two rectangular internal cavities comprise a first rectangular internal cavity and a second rectangular internal cavity; a first bending conductor assembly and a second bending conductor assembly are arranged at the bottom of the first rectangular internal cavity; a third bending conductor assembly and a fourth bending conductor assembly are arranged at the bottom of the second rectangular internal cavity; and the dielectric plate is provided with a first microstrip line, a second microstrip line, a third microstrip line and a fourth microstrip line. The duplexer has the advantages of simple structure, easy processing and good performance, and can satisfy requirements of miniaturization of communication.

Description

technical field [0001] The invention relates to a duplexer, in particular to a single-cavity three-mode cavity duplexer based on bending grounding probe feeding, and belongs to the field of wireless communication. Background technique [0002] The function of the microwave duplexer is to isolate the transmitting and receiving signals, so as to ensure that both receiving and transmitting can work normally at the same time. It is composed of two sets of band-stop filters with different frequencies to prevent the transmission signal from the machine from being transmitted to the receiver. With the development of wireless communication technology, the frequency band between signals becomes narrower and narrower, which puts forward higher requirements on the specifications and reliability of duplexers. The cavity filter has the advantages of high Q value, large power capacity, easy implementation and stable performance, so it has high application value. The cavity filter achiev...

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Problems solved by technology

The author proposes a three-mode structure using metal cavity chamfering, the structure is as follows Figure 5a As shown in , several resonant modes are shifted to our required passband by controlling the size of the cut angle. Its simulation results are as follows Figure 5b shown; the structure of this coupling method is not easy to process

[0007] 4) In January 2004, L.H.Chua et al published an article titled "Analysis of dielectric loaded cubic cavity for triple mode filter design", proposing to use coaxial cable as feed, such as Figure 6a As shown, the dielectric cavity filter structure using tuning screws, the simulation results are as follows Figure 6b As shown; the adjustable range of this structure using coupling screws is relatively small, and there are certain deficiencies

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